WPF: Placing textbox next to radiobutton in stackpanel

Question

I have a stackpanel containing two radio buttons (Option 1 and Option 2). If the user selects Option 2 a textbox should be active that allows the user to give some more details about Option 2.

I came up with two solutions but none of them is exactly what I want. This is how they look like:

Screenshot of solution #1 and #2

Solution #1

The XAML-code of solution #1 is very simple and the result is pretty obvious:

    <StackPanel Grid.Row="7" Grid.Column="1">
        <RadioButton>Option 1</RadioButton>
        <RadioButton>Option 2:</RadioButton>
        <TextBox>Some Text that details option 2</TextBox>
    </StackPanel>

What's good here is that the textbox uses the entire width. Nevertheless, that's not what I wanted since the textbox should be placed next to the Option 2.

Solution #2

The next step was to create a grid in the RadioButton-tags. That allowed me to place the textbox at the proper position but then the width doesn't scale up to 100 % anymore.

The code looks like this:

    <StackPanel Grid.Row="8" Grid.Column="1">
        <RadioButton>Option 1</RadioButton>
        <RadioButton>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition Width="130*" />
                </Grid.ColumnDefinitions>
                <TextBlock Grid.Column="0" >Option 2:</TextBlock>
                <TextBox Grid.Column="1" Margin="10,0,0,0">Some Text that details option 2</TextBox>
            </Grid>
        </RadioButton>
    </StackPanel>

Besides the point that this looks to me like a quite over-engineered solution, the question is here: How to set the width of grid within a radio button entry to 100%?

A similar question was asked here (How to set width to 100% in WPF) but using the ItemContainerStyle property does not work for radiobuttons.

In my eyes, there must be a much easier (or at least a working) solution. Can anyone help?

score 4 · Accepted Answer · answered Dec 25 '12 at 16:21

Use this:

<StackPanel Grid.Row="8"
            Grid.Column="1">
    <RadioButton>Option 1</RadioButton>
    <RadioButton HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
        <DockPanel  LastChildFill="True">
            <TextBlock >Option 2:</TextBlock>
            <TextBox Grid.Column="1"  
                     Margin="10,0,0,0">Some Text that </TextBox>
        </DockPanel>
    </RadioButton>
</StackPanel>

Or if you want to keep the Grid:

 <StackPanel Grid.Row="8"
            Grid.Column="1">
    <RadioButton>Option 1</RadioButton>
    <RadioButton HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
        <Grid  HorizontalAlignment="Stretch">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <TextBlock >Option 2:</TextBlock>
            <TextBox Grid.Column="1"  
                     Margin="10,0,0,0">Some Text that </TextBox>
        </Grid>
    </RadioButton>
</StackPanel>

Which solution would you prefer? To me the grid-solution is a bit more intuitive. What do you think? — brgn, Dec 25 '12 at 16:28

score 1 · Answer 2 · answered Apr 18 '19 at 05:41

You can design anyway you want. Just apply same GroupName to all RadioButtons

<StackPanel>
    <RadioButton Content="Option1" GroupName="Question" />
    <StackPanel Orientation="Horizontal">
        <RadioButton Content="Option2" GroupName="Question" />
        <TextBox Text="Other controls"/>
    </StackPanel>
</StackPanel>

score 0 · Answer 3 · answered Dec 25 '12 at 16:16

There are many things you can try out -

Set the HorizontalAlignment of the 2nd RadioButton to "Stretch";
Try setting it on the Grid instead;
Having a ColumnDefinition set to "Auto" and another one at "130*" doesn't really make any sense. Have the first one at Auto (will size itself to content) and the second one at "*" (use all the available space)

The * sizing is relative. If you had 1* and 2*, 2* would always be twice as big as 1*. Same thing with 0.5* and 1*, the first one will always be half the size of 1*.

Did you try setting both ColumnDefinitions to Auto?

Else, something you can use to troubleshoot this sort of thing is to apply a border around your elements (each element gets a different border color). It helps finding which control is the culprit.

HorizontalAlignment is not enough, He should set HorizontalContentAlignment — Ramin, Dec 25 '12 at 16:23

WPF: Placing textbox next to radiobutton in stackpanel

Solution #1

Solution #2

3 Answers3